Biological removal of heavy metal from automotive hazardous paint sludge by semi- continuous bioleaching process

Subject Areas : Biotechnological Journal of Environmental Microbiology

Fatemeh Honarjooy Barkusaraey ^{1 *} , Roya Mafigholami ² , Golam Khayatii ³

1 - Environmental Engineering, Guilan Water and Wastewater Company, Lahijan, Iran
2 - Water and Wastewater Engineering Group , West Tehran Branch, Islamic Azad University,Tehran,Iran
3 - Department of Chemical Engineering, Faculty of Engineering, University of Guilan, Rasht, Iran

Received: 2024-02-07 Accepted : 2024-03-04 Published : 2024-03-09

Keywords: Heavy Metals, Semi-Continuous Bioleaching, Central Composite Design, Indigenous Pseudomonas aeruginosa ,

Abstract :

Few studies have been conducted on detoxification, metal recovery, and stabilization prior to landfilling automotive paint sludge as hazardous waste. Most studies have focused on the direct use of paint sludge as a sealant and primer, its application in construction materials such as concrete, and the extraction of valuable organic and mineral materials from paint sludge. This study was conducted to remove heavy metals in batch conditions using indigenous Pseudomonas aeruginosa bacteria in water-based paint sludge under semi-continuous conditions, utilizing optimal parameters obtained from a previous study with constant parameters of pH 7, a temperature of 32 °C, paint sludge with a 3 mm mesh, a shaker speed of 180 rpm, and variable parameters of aeration(oxygen) and nutrients (glucose) for the removal of zinc and other metals. The results showed that increasing glucose and aeration have linear (direct) effects on the removal process of zinc and other metals, along with a mutual interaction between these two parameters.

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